CN116474762B - A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere - Google Patents
A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere Download PDFInfo
- Publication number
- CN116474762B CN116474762B CN202310194321.9A CN202310194321A CN116474762B CN 116474762 B CN116474762 B CN 116474762B CN 202310194321 A CN202310194321 A CN 202310194321A CN 116474762 B CN116474762 B CN 116474762B
- Authority
- CN
- China
- Prior art keywords
- sulfur hexafluoride
- catalytic material
- moo
- degradation
- air atmosphere
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 239000000463 material Substances 0.000 title claims abstract description 76
- 230000003197 catalytic effect Effects 0.000 title claims abstract description 72
- 229910018503 SF6 Inorganic materials 0.000 title claims abstract description 63
- SFZCNBIFKDRMGX-UHFFFAOYSA-N sulfur hexafluoride Chemical compound FS(F)(F)(F)(F)F SFZCNBIFKDRMGX-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229960000909 sulfur hexafluoride Drugs 0.000 title claims abstract description 63
- QXYJCZRRLLQGCR-UHFFFAOYSA-N dioxomolybdenum Chemical compound O=[Mo]=O QXYJCZRRLLQGCR-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 239000012298 atmosphere Substances 0.000 title claims abstract description 26
- 230000000593 degrading effect Effects 0.000 title claims abstract description 17
- 238000006731 degradation reaction Methods 0.000 claims abstract description 61
- 230000015556 catabolic process Effects 0.000 claims abstract description 60
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 22
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000034 method Methods 0.000 claims abstract description 20
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 14
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 6
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 abstract description 8
- 238000000227 grinding Methods 0.000 abstract description 5
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 29
- 230000000694 effects Effects 0.000 description 14
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000010453 quartz Substances 0.000 description 8
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000003513 alkali Substances 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000005431 greenhouse gas Substances 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000001179 sorption measurement Methods 0.000 description 3
- 239000002912 waste gas Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000012299 nitrogen atmosphere Substances 0.000 description 2
- 238000010792 warming Methods 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 239000012300 argon atmosphere Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002173 high-resolution transmission electron microscopy Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- -1 metal oxide fluoride Chemical class 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 229910001463 metal phosphate Inorganic materials 0.000 description 1
- 238000001782 photodegradation Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000027756 respiratory electron transport chain Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 239000013598 vector Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8659—Removing halogens or halogen compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/24—Chromium, molybdenum or tungsten
- B01J23/28—Molybdenum
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J27/00—Catalysts comprising the elements or compounds of halogens, sulfur, selenium, tellurium, phosphorus or nitrogen; Catalysts comprising carbon compounds
- B01J27/24—Nitrogen compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Catalysts (AREA)
Abstract
本发明公开了一种空气气氛下降解六氟化硫的基于二氧化钼的催化材料，涉及催化材料技术领域，其特征在于：所述催化材料以二氧化钼作为活性位点中心，以碳化硅、二氧化硅中的一种或多种作为载体，所述二氧化钼材料用于在空气气氛下对六氟化硫进行催化降解,本发明的MoO2基催化材料，以MoO2作为活性位点中心，以碳化硅、二氧化硅材料中的一种或多种作为载体，通过简单的物理研磨方法可制备而得，无需烧结，工艺简单，加工成本低，适合大规模生产。
The invention discloses a catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere, which relates to the technical field of catalytic materials and is characterized in that: the catalytic material uses molybdenum dioxide as the active site center and uses one or more of silicon carbide and silicon dioxide as a carrier, and the molybdenum dioxide material is used for catalytic degradation of sulfur hexafluoride in an air atmosphere. The MoO2- based catalytic material of the invention uses MoO2 as the active site center and uses one or more of silicon carbide and silicon dioxide materials as a carrier, can be prepared by a simple physical grinding method, does not require sintering, has a simple process, has a low processing cost, and is suitable for large-scale production.
Description
Technical Field
The invention relates to the technical field of materials, in particular to a molybdenum dioxide-based catalytic material for degrading sulfur hexafluoride in an air atmosphere, and belongs to the technical field of environmental protection for preventing and controlling polluted gas.
Background
In 1997, the kyoto protocol listed sulfur hexafluoride in a greenhouse gas sequence. Sulfur hexafluoride is a strong greenhouse gas with a greenhouse potential (Global Warming Potential, GWP) that is approximately 23900 times the same amount of carbon dioxide (CO 2) (calculated over a 100 year period). The boost effect of global warming by discharging 1 kilogram of sulfur hexafluoride is equivalent to carbon dioxide discharged by 24 aircraft taking one trip back and forth between london and new york. Particularly, sulfur hexafluoride has stable property and is not easy to decompose, and can stably exist in the atmosphere for 3200 years. With the use of sulfur hexafluoride in large quantities, the higher the concentration of sulfur hexafluoride accumulated in the atmosphere, the more remarkable the effect on global climate. Therefore, sulfur hexafluoride gas is also an object of global greenhouse gas emission reduction. In addition, corrosive and highly toxic products such as S 2F10、SF4 are generated in the decomposition reaction process of sulfur hexafluoride, so that the sulfur hexafluoride has great harm to human bodies. Currently, the total amount of sulfur hexafluoride gas emitted annually worldwide is equivalent to 1.25 hundred million tons of carbon dioxide (CO 2). In 2020, the equivalent of carbon emission caused by sulfur hexafluoride gas discharged in China reaches 8500 ten thousand tons, and the equivalent of carbon emission is about 70% of the world. Therefore, the emission reduction of sulfur hexafluoride has important significance for China.
The prior emission reduction measures aiming at SF 6 are to recycle and compress the high-concentration sulfur hexafluoride gas used in retired equipment, then transport the high-concentration sulfur hexafluoride gas to a provincial center, uniformly adopt purification treatment, and recycle the raw waste gas with the purity of SF 6 being more than 70% by adopting a compression recycling technology, and have a small leakage risk. In addition, scholars have studied a variety of methods such as adsorption, thermal decomposition, photodegradation, plasma method and catalytic degradation, wherein the catalytic degradation method is of special interest, and sulfur hexafluoride degradation mainly comprises three types of catalysts, namely metal oxide, metal phosphate and supported metal catalyst. These catalysts are all carried out in argon or nitrogen atmosphere with the temperature above 600 ℃ and lack of degradation mechanism and technical research under the condition of lower-temperature atmospheric environment. For example Zhang Jia et al (CN 103007736 a) utilize electroplating sludge to degrade sulfur hexafluoride more effectively, but the degradation process is carried out under a nitrogen atmosphere. Under the actual condition, sulfur hexafluoride is in the atmosphere, and the protective atmosphere greatly prevents the SF 6 from degrading the practical application of the catalyst. It is therefore an urgent need to develop a catalytic material capable of degrading SF 6 under a general air atmosphere at low temperature.
Disclosure of Invention
The first aspect of the present invention aims to overcome the above drawbacks, and a degradation material based on molybdenum dioxide is synthesized, so as to realize low energy consumption degradation of SF 6 in an air atmosphere.
The aim of the invention is achieved by the following technical scheme:
A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere is characterized in that the catalytic material takes molybdenum dioxide as an active site center and one or more of silicon carbide and silicon dioxide as a carrier, and the molybdenum dioxide material is used for carrying out catalytic degradation on sulfur hexafluoride in the air atmosphere.
The second aspect of the invention aims to provide a preparation method of the catalytic material, which comprises the following steps of physically mixing MoO 2 powder with a carrier to obtain the catalytic material (MoO 2 -based catalytic material) based on molybdenum dioxide for efficiently degrading sulfur hexafluoride.
Further:
the carrier is selected from any one or more of silicon carbide, silicon dioxide and other materials, and preferably silicon carbide.
The physical mixing method comprises the steps of mixing a carrier and MoO 2 powder, and then physically grinding to obtain a powdery MoO 2 -based catalytic material.
The mass ratio of MoO 2 to 50wt%, particularly preferably 10wt%, in the catalytic material.
The third aspect of the invention aims to provide an application of the MoO 2 -based catalytic material in catalytic degradation of sulfur hexafluoride, which is characterized by comprising the following steps:
(1) Introducing sulfur hexafluoride mixed gas into the MoO 2 -based catalytic material, wherein the sulfur hexafluoride mixed gas is prepared by mixing sulfur hexafluoride and air, and the volume concentration of the sulfur hexafluoride is controlled to be not more than 60 vol%
(2) Carrying out high-temperature treatment on a MoO 2 -based catalytic material at 300-700 ℃ in the mixed gas atmosphere of sulfur hexafluoride;
(3) The tail gas is treated and collected by sodium hydroxide solution.
Further:
The high temperature treatment in step (2) is performed at 300 to 700 ℃, preferably 450 to 600 ℃.
Compared with the prior art, the invention has the following beneficial effects:
(1) The MoO 2 -based catalytic material provided by the invention is prepared by taking MoO 2 as an active site center and one or more of silicon carbide and silicon dioxide materials as a carrier through a simple physical grinding method, and is free from sintering, simple in process, low in processing cost and suitable for large-scale production.
(2) Experiments prove that the catalytic material has excellent degradation capability on sulfur hexafluoride, further reduces the temperature compared with the prior art, has low energy consumption, basically does not generate toxic gas, and accords with the environment-friendly concept.
(3) The catalytic material can degrade sulfur hexafluoride in an air atmosphere, is different from the prior technology which needs to degrade in a nitrogen or argon protective atmosphere, is quite in line with the actual situation, and has great practical potential.
(4) The catalytic material has very rapid degradation response capability to sulfur hexafluoride and longer service life.
Embodiments of the present invention will be further described below with reference to the accompanying drawings, and the following examples are given by way of illustration of detailed embodiments and specific operational procedures, but the scope of the present invention is not limited to the above examples.
Drawings
FIG. 1 is a scanning electron microscope image of the MoO 2 -based catalytic material prepared in example 1.
FIG. 2 is a high resolution transmission electron microscope image of the MoO 2 -based catalytic material prepared in example 1.
FIG. 3 is a schematic diagram of an apparatus for catalytic degradation of sulfur hexafluoride in accordance with the invention.
Fig. 4 is a graph showing the increase of sulfur hexafluoride degradation efficiency with time duration.
FIG. 5 is a graph showing the effect of different compositions of MoO 2 -based catalytic materials on sulfur hexafluoride degradation efficiency and degradation amount comparison.
FIG. 6 is a graph showing the effect of different carrier selections of MoO 2 -based catalytic materials on sulfur hexafluoride degradation efficiency.
FIG. 7 is a graph showing the effect of different treatment temperatures on sulfur hexafluoride degradation efficiency.
Detailed Description
Example 1:
1. Preparation of MoO 2 -based catalytic Material
MoO 2 is taken as an active center, silicon carbide is taken as a carrier, the mass ratio of MoO 2 in the material is controlled to be 10wt%, and the MoO 2 and the silicon carbide are mixed and ground to obtain the powdery MoO 2 -based catalytic material.
The back-scattered electron image of the prepared MoO 2 -based catalytic material is shown in FIG. 1, the bright part is MoO 2, and the dark part is silicon carbide. The MoO 2 -based catalytic material was then characterized using high resolution transmission electron microscopy, as shown in FIG. 2. MoO 2 is dispersed in the silicon carbide carrier, and the two components are fused at the interface to form MoO 2/SiC heterojunction.
Device for treating sulfur hexafluoride by MoO 2 -based catalytic material
The device for treating sulfur hexafluoride by using the MoO 2 -based catalytic material is shown in FIG. 3, and comprises a1 pure sulfur hexafluoride gas steel cylinder, a 2 gas flowmeter, a 3 gas mixer, a 4 quartz reaction tube, a 5-tube furnace, a 6-alkali liquor recovery device, a 7-gas chromatograph, an A air inlet and a B reacted gas outlet. Wherein, air and sulfur hexafluoride gas enter a gas mixer 3 through a gas flowmeter 2 to be mixed and then enter a quartz reaction tube 4, moO 2 -based catalytic materials are arranged in the quartz reaction tube 4, the quartz reaction tube 4 is arranged in a tube furnace 5, the gas treated by the quartz reaction tube 4 is heated to the treatment temperature through the tube furnace 5 and is sent into an alkali liquor recovery device 6, and the alkali liquor recovery device 6 adopts 5mol/L sodium hydroxide solution to treat and collect tail gas.
A process for treating sulfur hexafluoride by a moo 2 -based catalytic material, comprising the steps of:
(1) Sulfur hexafluoride waste gas is configured:
the sulfur hexafluoride waste gas used in the experiment is a mixed gas of sulfur hexafluoride and air in a simulation configuration, and in this embodiment, the concentration of sulfur hexafluoride is controlled to be 2vol.% by the gas flowmeter and the gas mixing device.
(2) Filling the mixed and ground MoO 2 -based catalytic material into a quartz reaction tube, and continuously feeding sulfur hexafluoride mixed gas into the quartz reaction tube for waiting treatment.
(3) The quartz reactor tube was placed in a tube furnace and the temperature was controlled at 500 ℃ and the degradation efficiency was recorded every 10 minutes until the degradation efficiency was poor or 0, and the results are shown in fig. 4.
As can be seen from FIG. 4, sulfur hexafluoride has better degradation efficiency at 500 ℃, the degradation duration is longer than 120 minutes, the highest degradation rate reaches 73.33% at 40 minutes, and the degradation amount of SF 6 on unit mass MoS 2 is 123.49mL g -1. The tail gas from the reaction tube is led into an alkali liquor recovery device, and the gas after tail gas absorption is carried out by 5mol/L sodium hydroxide solution, so that the gas can be directly discharged into the atmosphere.
Example 2:
The preparation method, the treatment device and the treatment process of the MoO 2 -based catalytic material of the example 1 are adopted, except that the proportion of silicon carbide and MoO 2 in the MoO 2 catalytic material is adjusted as shown in the table 1, the effect on degradation efficiency is tested, and the result is shown in fig. 5.
TABLE 1 composition and proportions of different MoO 2 -based catalytic materials
Analysis:
The mass ratio of MoO 2 in the degradation material has a great influence on the SF 6 degradation effect. The highest degradation rate of 5wt% MoO 2 -based catalytic material is 50.09%, the SF 6 degradation amount per unit mass MoO 2 reaches 122.49mL g -1, and the degradation life is 110 minutes. When the specific gravity of MoO 2 was increased to 10wt%, the highest degradation rate was increased to 73.33%, and the degradation amount of SF 6 per unit mass of MoO 2 was 123.42mL g -1, which was almost the same as that of 5wt% of MoO 2 -based catalytic material. However, as the content of MoO 2 further increases, the degradation effect of SF 6 begins to decrease. When MoO 2 content reached 20wt%, the amount of SF 6 degradation per unit mass MoO 2 was almost halved, decreasing from 123.42mL g -1 to 64.65mL g -1, although the total amount of SF 6 degraded during the whole degradation was almost unchanged (12.34 mL total at 10wt% and 12.93mL total at 20 wt%). when the MoO 2 content was further increased to 50wt%, there was a significant decrease in both the amount of SF 6 degradation per unit MoO 2 and the total amount of SF 6 degradation. This is because SiC acts as an electron donor and a dispersant in the composite. On one hand, the reduction of SiC limits the electron diffusion efficiency, greatly weakens the degradation site of Mo, and meanwhile, the metal oxide fluoride can be sintered again at high temperature, so that the contact area is possibly reduced, the gas flow is blocked, and the reaction rate is reduced. Therefore, the content of MoO 2 in the MoO 2 -based catalytic material is preferably 10wt%.
Example 3:
the MoO 2 -based catalytic material preparation method, treatment apparatus and treatment process of example 1 were used, except that the selection of the support was adjusted as shown in Table 2, and the effect on degradation efficiency was tested, and the results are shown in FIG. 6.
TABLE 2 selection of different vectors
Analysis:
The choice of different supports will have a great impact on the performance of the MoO 2 -based catalytic material. Pure MoO 2 cannot degrade SF 6 at 500 ℃. This is because MoO 2 has a large crystal size and a small specific surface area, which is disadvantageous for adsorption of SF 6. Meanwhile, the charge distribution in the pure MoO 2 material is very uniform, and the electron transfer to SF 6 molecules is not facilitated, so that the degradation effect is not achieved. When SiO 2 powder was chosen as carrier, the degradation effect on SF 6 was poor. Degradation of SF 6 can only be achieved when SiC is used as a carrier. The SiC has high hardness, is a common grinding agent, and is more uniform in size after being mixed with MoO 2, thereby being beneficial to adsorption and reaction. In addition, siC has semiconductor properties that allow electrons to be redistributed between MoO 2 and SiC, which can be used to accelerate activation and degradation of SF 6. Thus, the most preferred support for the MoO 2 -based catalytic material is silicon carbide.
Example 4:
The MoO 2 -based catalytic material preparation method, treatment device and treatment process of example 1 were used, except that the treatment temperature of the tube furnace was adjusted as shown in Table 3, and the effect of the treatment temperature on degradation efficiency was tested, and the results are shown in FIG. 7.
TABLE 3 different degradation temperatures
Analysis:
the degradation temperature can affect the degradation effect of the MoO 2 -based catalytic material. At 450 ℃, the MoO 2 -based catalytic material hardly activated SF 6. When the temperature is raised to 500 ℃, the MoO 2 -based catalytic material starts to react with SF 6, and the highest degradation rate is 73.33%, and the SF 6 degradation amount of unit MoO 2 reaches 123.42mL g -1. as the temperature increases, the highest degradation rate and degradation amount of the MoO 2 -based catalytic material to SF 6 also increases. At 550 ℃, the highest degradation rate reaches 94.89%, the degradation amount of SF 6 reaches 391.13mL g -1, and the degradation life is prolonged to 260 minutes. When the temperature is further increased to 600 ℃, SF 6 can reach 100% degradation, the unit degradation amount reaches 664.79mL g -1, and the degradation life is as long as 400 minutes. Therefore, it is easy to see that the temperature has great influence on the degradation effect of SF 6, and the high temperature is favorable for activating and degrading SF 6 molecules by the MoO 2 -based catalytic material. The degradation temperature is preferably 500 ℃ for energy saving and economical reasons.
Summarizing:
1. The MoO 2 -based catalytic material provided by the invention is prepared by taking MoO 2 as an active site center and taking a silicon carbide material as a carrier through a simple physical grinding method, does not need sintering, is simple in process and low in processing cost, is suitable for large-scale production, and is proved by experiments to be capable of degrading sulfur hexafluoride in an air atmosphere, and is different from the conventional technology of degrading in a nitrogen or argon protective atmosphere, so that the catalytic material is quite in line with actual conditions and has great practical potential.
2. By optimizing the iron doping proportion, the carrier selection, the MoO 2 -carrier proportion, the treatment temperature and the like, excellent degradation efficiency can be effectively obtained at a lower temperature, and the optimal implementation scheme is that the carrier is selected to be silicon carbide, the mass ratio of MoO 2 in the catalytic material is 10wt%, and the treatment temperature is 500 ℃.
Claims (8)
1. The application of a catalytic material based on molybdenum dioxide in degrading sulfur hexafluoride in an air atmosphere is characterized by comprising the following steps:
(1) Introducing sulfur hexafluoride mixed gas into the MoO 2 -based catalytic material, wherein the sulfur hexafluoride mixed gas is prepared by mixing sulfur hexafluoride and air, and the volume concentration of the sulfur hexafluoride is controlled to be not more than 60 vol percent;
The catalytic material takes molybdenum dioxide as an active site center and one or more of silicon carbide and silicon dioxide as a carrier, and is used for carrying out catalytic degradation on sulfur hexafluoride in an air atmosphere;
(2) Carrying out high-temperature treatment on a MoO 2 -based catalytic material at 300-700 ℃ in the mixed gas atmosphere of sulfur hexafluoride;
(3) The tail gas is treated and collected by sodium hydroxide solution.
2. The method of claim 1, wherein in step (1), moO 2 powder is physically mixed with a carrier to obtain a catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere.
3. The method of claim 1, wherein in step (1), the carrier is silicon carbide.
4. The method for degrading sulfur hexafluoride by using the catalytic material according to claim 1, wherein in the step (1), the carrier and the MoO 2 powder are mixed and then physically ground to obtain the powdery MoO 2 -based catalytic material.
5. The application of the catalytic material in degrading sulfur hexafluoride in an air atmosphere according to claim 1, wherein in the step (1), the mass ratio of MoO 2 in the catalytic material is 5-wt% -50 wt%.
6. The use of a catalytic material according to claim 1 for degrading sulfur hexafluoride in an air atmosphere, wherein in step (1) the mass ratio of MoO 2 in the catalytic material is 10: 10 wt%.
7. The application of the catalytic material in degrading sulfur hexafluoride in an air atmosphere according to claim 1, wherein the high-temperature treatment in the step (2) is performed at a temperature of 450-600 ℃.
8. The method of claim 1, wherein the high temperature treatment in step (2) is carried out at 500 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310194321.9A CN116474762B (en) | 2023-03-03 | 2023-03-03 | A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310194321.9A CN116474762B (en) | 2023-03-03 | 2023-03-03 | A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116474762A CN116474762A (en) | 2023-07-25 |
| CN116474762B true CN116474762B (en) | 2025-01-28 |
Family
ID=87220300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310194321.9A Active CN116474762B (en) | 2023-03-03 | 2023-03-03 | A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116474762B (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7510645B2 (en) * | 2005-11-04 | 2009-03-31 | Uop Llc | Hydrocracking catalyst containing beta and Y zeolites, and process for its use to produce naphtha |
| JP2008142696A (en) * | 2006-07-12 | 2008-06-26 | Ube Ind Ltd | Support-supported sulfur-containing zirconium oxide catalyst for fluorine-containing compound gas decomposition and fluorine compound-containing compound gas or exhaust gas decomposition method containing fluorine-containing compound gas using the catalyst |
| KR101406198B1 (en) * | 2011-05-31 | 2014-06-12 | 주식회사 코캣 | Catalyst for removing SF6 and preparatio method thereof |
| WO2018148168A1 (en) * | 2017-02-08 | 2018-08-16 | Sabic Global Technologies B.V. | Three dimensional ceramic and metal monolith catalysts for carbon dioxide reduction by gaseous sulfur |
| CN107126948B (en) * | 2017-04-18 | 2020-07-10 | 北京宇极科技发展有限公司 | Molybdenum based catalyst |
| CN113244939A (en) * | 2021-05-17 | 2021-08-13 | 南通虹登机械设备有限公司 | Silicon carbide-iron oxide composite material for decomposing sulfur hexafluoride in atmospheric environment and application thereof |
-
2023
- 2023-03-03 CN CN202310194321.9A patent/CN116474762B/en active Active
Non-Patent Citations (1)
| Title |
|---|
| "Partial oxidation of surrogate Jet-A fuel over SiO2 supported MoO2";Shreya Shah et al.;《Applied Catalysis B: Environmental》;20160407;第193卷;第1节最后1段 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116474762A (en) | 2023-07-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104923153A (en) | Preparation method for Canna biological carbon capable of simultaneously adsorbing ammonia nitrogen and cadmium | |
| CN104549154B (en) | The preparation method of the charcoal of cadmium in the safe adsorbed water body of energy | |
| CN110479264A (en) | Using waste and old rare earth based denitration catalyst as the preparation method of the porous ceramics film catalyst of raw material | |
| CN114392762B (en) | Composite material based on two-dimensional MXene nano structure and preparation method thereof | |
| CN116474762B (en) | A catalytic material based on molybdenum dioxide for degrading sulfur hexafluoride in an air atmosphere | |
| CN111495402A (en) | A kind of preparation of molybdenum-based composite material by microwave spark and its method and application | |
| CN114535277B (en) | Application of iron-containing steel slag combined with thermal desorption technology in repairing phthalate polluted soil and repairing method thereof | |
| CN115072659A (en) | A kind of method for producing hydrogen from polyethylene plastic | |
| CN113244939A (en) | Silicon carbide-iron oxide composite material for decomposing sulfur hexafluoride in atmospheric environment and application thereof | |
| CN114146723A (en) | Iron-nitrogen co-doped nano carbon composite catalyst, preparation method and application | |
| CN111774403B (en) | A method for synchronously encapsulating heavy metals by synthesizing sodalite from waste incineration fly ash and heavy metal wastewater | |
| WO2025007695A1 (en) | In-situ grown co/cnt catalyst and use thereof | |
| CN116422346B (en) | A catalytic material based on iron-doped molybdenum disulfide for degrading sulfur hexafluoride in air atmosphere | |
| CN119588392A (en) | Zirconium carbide-based catalytic material capable of degrading sulfur hexafluoride in air atmosphere, preparation method of zirconium carbide-based catalytic material and method for degrading sulfur hexafluoride | |
| CN119588391A (en) | Titanium carbide-based catalytic material capable of degrading sulfur hexafluoride in air atmosphere, and preparation method and application thereof | |
| CN117753366A (en) | A carbon-based fast adsorbent with ultra-large adsorption capacity and its preparation method and application | |
| CN114602525B (en) | Aluminum nitride-based ceramic organic matter contaminated soil thermal desorption catalyst and preparation method and application thereof | |
| CN113663724B (en) | Platinum-based water treatment monatomic catalyst and preparation method thereof | |
| CN115814829A (en) | Co and Mo 2 C-codoped biochar-based composite material and preparation method and application thereof | |
| CN1587038A (en) | Method for preparing granular active carbon using dust removing carbon as raw material | |
| CN110756208A (en) | Graphite-phase carbon nitride material for catalytic reduction of p-nitrophenol and preparation method and application thereof | |
| CN110372050A (en) | The application and its method of a kind of lateritic nickel ore as catalyst in the treatment of waste water | |
| CN117049763B (en) | Method for degrading sludge organic matters by wet oxidation technology | |
| CN116874281B (en) | A ceramsite prepared by using sludge anaerobic digestion residue and its preparation method and application | |
| CN114950336B (en) | A carbon-nitrogen-doped copper-based material, its preparation method and application, and a method for purifying tail gas containing phosphine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20240927 Address after: 201100 Building 1, No.600 Jianchuan Road, Minhang District, Shanghai Applicant after: Shanghai Qianronghe Low Carbon Technology Partnership Enterprise (Limited Partnership) Country or region after: China Address before: Room 501, Building B, Science and Technology Park, No. 398, Ma Huan Road, Binhai New District, Yuecheng District, Shaoxing City, Zhejiang Province, 312000 Applicant before: Shaoxing Institute of New Energy and Molecular Engineering, Shanghai Jiaotong University Country or region before: China |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |